CMMG's Barrel Sub-Assembly is ideal for building your custom AR-15 upper group. It comes with properly installed M4 barrel extension.
| FireArm | No |
| Caliber or Gauge | 223 Remington/5.56 NATO |
| Model | Barrel Sub-Assembly |
| Finish | Nitride |
| Sights | None |
| Twist | 1:7" |
| Type | Rifle |
| Length | 16.10" |
| Barrel Type | Carbine Length |
| Barrel Features | M4 Profile |
